7th 7-1 Likelihood and Probability

Front

What is probability?

Back

Probability is a measure of how likely an event is to occur, expressed as a number between 0 and 1, where 0 means the event cannot happen and 1 means the event is certain to happen.

Front

How do you calculate the probability of an event?

Back

Probability of an event = (Number of favorable outcomes) / (Total number of possible outcomes).

Front

What is the probability of drawing a yellow disk from a bag containing 5 yellow disks and 20 other disks?

Back

P(yellow) = 5 / (5 + 20) = 5 / 25 = 1/5 or 0.2.

Front

If a spinner has 4 equal sections, what is the probability of landing on any one section?

Back

The probability of landing on any one section = 1 / 4 = 0.25.

Front

What does it mean if an event is 'certain'?

Back

An event is 'certain' if it is guaranteed to happen, with a probability of 1.

Front

What does it mean if an event is 'impossible'?

Back

An event is 'impossible' if it cannot happen at all, with a probability of 0.

Front

Convert the probability 9/10 to a percentage.

Back

9/10 = 0.9 = 90%.

Front

What is the difference between mean and median?

Back

Mean is the average of a set of numbers, while median is the middle value when the numbers are arranged in order.

Front

What is an interquartile range (IQR)?

Back

IQR is a measure of statistical dispersion, representing the range between the first quartile (Q1) and the third quartile (Q3) in a data set.

Front

If the probability of an event is 0.25, what is the probability of it not occurring?

Back

The probability of it not occurring = 1 - P(event) = 1 - 0.25 = 0.75.